engine Seat Mii 2015 Workshop Manual

Operation
running, the internal friction in the engine is
gr e
at
er than later on when all the moving
parts have bedded down.
How the vehicle is driven for the first 1,500
km influences the future engine perform-
ance. Throughout the life of the vehicle, it
should be driven at a moderate speed, espe-
cially when the engine is cold, as this will re-
duce engine wear and increase its useful life.
Never drive at extremely low engine speeds.
Change down to a lower gear when the en-
gine no longer runs “smoothly”. Up to 1,000
kilometres the following instructions apply:
● Do not use full throttle.
● Do not force the engine above two thirds of
its max
imum speed.
Between 1,000 and 1,500 kilometres, gradu-
ally increase power until reaching the maxi-
mum speed and high engine speeds.
Running in new tyres and brake pads
● Replacement of wheel rims and new tyres
›››
page 197
● Notes on the brakes ›››
page 132 For the sake of the environment
If the engine is run in gently, the life of the
engine w i

ll be increased and the engine oil
consumption reduced. Environmental compatibility
Environmental protection is a top priority in
the des
ign, c

hoice of materials and manufac-
ture of your new SEAT.
Constructive measures to encourage recy-
cling
● Joints and connections designed for easy
dismantlin
g
● Modular construction to facilitate disman-
tling
● Incr

eased use of single-grade materials.
● Plastic parts and elastomers are marked in
acc or

dance with ISO 1043, ISO 11469 and
ISO 1629.
Choice of materials
● Use of recycled materials.
● Use of compatible plastics in the same part
if its c
omponents are not easily separated.
● Use of recycled materials and/or materials
originating fr
om renewable sources.
● Reduction of volatile components, includ-
ing odour, in p
lastic materials.
● Use of CFC-free coolants.
Ban on heavy
metals, with the exceptions
dictated by law (Annex II of ELV Directive
2000/53/EC): cadmium, lead, mercury, hexa-
valent chromium. Manufacturing methods
●
Reduction of the quantity of thinner in the
protectiv
e wax for cavities.
● Use of plastic film as protection during ve-
hicle tr
ansport.
● Use of solvent-free adhesives.
● Use of CFC-free coolants in cooling sys-
tems.
● Recy

cling and energy recovery from resi-
dues (RDF).
● Impr

ovement in the quality of waste water.
● Use of systems for the recovery of residual
heat (therm
al recovery, enthalpy wheels,
etc.).
● The use of water-soluble paints.
142

Driving
Economical and environmentally
friendly driv
in
gFig. 147
Fuel consumption in litres per
100 km at 2 diff
er

ent outside temperatures Fuel consumption, environmental impact and
en
gine, br
ak

e and tyre wear depend largely
on three factors:
● Personal driving style.
● Conditions of use (weather, road surface).
● Technical requirements.
Saving
s of up to 25% in fuel consumption
are possible with an appropriate driving style
and the adoption of certain simple tips.
Changing gear early
General instructions: The highest gear is al-
ways the most economical. As a guide, for
most vehicles at a speed of 30 km/h
(19 mph), drive in third gear, at 40 km/h (25 mph) in fourth gear and at 50 km/h
(31 mph) in fifth ge

ar.
In addition, “skipping” gears when shifting
up helps to save fuel, weather and traffic
conditions permitting.
Do not wait until the last moment before
changing gear. Only use first gear when you
move off and change to second gear quickly.
Avoid the kick-down function in vehicles with
automatic gearbox.
Vehicles with a gear display help to achieve
an economical driving style as the display in-
dicates the best moment to change gear.
Let the vehicle roll
If you take your foot off the accelerator, the
fuel supply is stopped and consumption is
reduced.
Allow the vehicle to roll without accelerating,
for example when approaching a red traffic
light. However, if the vehicle is rolling too
slowly or the distance is too long, the clutch
pedal should be pressed to declutch. The en-
gine will then operate at idle speed.
If the vehicle is going to be at a standstill for
a period of time, switch off the engine; for ex-
ample, while waiting at a level crossing.
Think ahead and “flow” with the traffic
Frequent acceleration and braking considera-
bly increase fuel consumption. If you think ahead as you drive and keep a safe distance
from the v
ehicle in front, it is possible to slow
down by simply lifting your foot off the accel-
erator. This eliminates the need for constant
braking and acceleration.
Calm and steady driving
Constancy is more important than speed: The
more you drive at a constant speed, the lower
the fuel consumption.
When driving on the motorway, it is more effi-
cient to drive at a constant and more moder-
ate speed than to be continuously accelerat-
ing and braking. As a general rule, you will
reach your destination just as quickly when
you drive at a constant speed.
The cruise control function helps you to ach-
ieve a constant style of driving.
Moderate use of additional devices
It is important to travel in comfort, but con-
venience systems should be used ecological-
ly.
Some equipment, when connected, increase
fuel consumption considerably, for example:
● Air conditioning cooling system: If the air
conditioning sy
stem is required to cool to
significantly lower temperatures than the true
outside temperature, it will require a large
amount of energy from the engine. Therefore,
we recommend that the selected temperature »
143
Technical data
Advice
Operation
Emergencies
Safety

Operation
for the vehicle is not too different to the out-
s ide t
emper
ature. It is a good idea to air the
vehicle before starting your journey and to
drive a short distance with the windows
open. Then you can close the windows and
switch on the air conditioning. Keep windows
closed when travelling at high speeds. Driv-
ing with the windows open increases fuel
consumption.
● Switch off the seat heating when the seats
have w
armed up.
● Switch off the heated rear window when it
is not
moist or covered in ice.
Avoid short journeys
Fuel consumption is much higher when the
engine is cold, immediately after it has been
started. It takes a few kilometres of driving
for the engine to warm up and to normalise
consumption.
The engine and catalytic converter need to
reach their proper working temperature in or-
der to minimise fuel consumption and emis-
sions. The ambient temperature has a deci-
sive influence.
Fig. 147 shows the difference in consump-
tion for the same journey at +20 °C (+68 °F)
and at -10 °C (+14 °F).
Therefore, unnecessary short journeys
should be avoided. Try to combine trips. The vehicle uses more fuel in winter than in
summer, ev

en when other conditions are the
same.
The engine takes a long time to warm up
when it is idling. In addition, mechanical
wear and pollutant emissions are also espe-
cially high during this initial warm-up phase.
It is therefore best to drive off immediately af-
ter starting the engine. Doing this avoids run-
ning the engine at a high speed.
Adjusting type pressures.
Having the correct pressure in your tyres
helps to reduce rolling resistance and, as a
result reduces fuel consumption. Increasing
the tyre pressure slightly (+0.2
bar/+3 psi/+200 kPa) can help to save fuel.
When you buy new tyres, make sure they are
optimised for minimum rolling resistance.
Use low friction engine oil
The use of low viscosity totally synthetic oils,
known as low friction engine oil, helps to re-
duce fuel consumption. These oils reduce the
resistance caused by friction in the engine,
they flow around the engine more quickly
and efficiently, particularly in cold starts. The
effect is particularly noticeable in vehicles
frequently used for short journeys.
Always check the engine oil level and ob-
serve service intervals (engine oil change in-
tervals). When purchasing engine oil, always observe
leg
al requirements and ensure that the oil is
approved by SEAT.
Avoid carrying unnecessary loads
The lighter the vehicle, the more economical
and ecological the driving style. For example,
an additional weight of 100 kg will increase
fuel consumption up to 0.3 l/100 km.
Remove any unnecessary objects or loads
from the vehicle.
Remove optional equipment and unnecessa-
ry accessories
The more aerodynamic the vehicle, the lower
the fuel consumption. Optional equipment
and accessories (such as roof racks or bike
carriers) reduce the aerodynamic benefits of
the vehicle.
Therefore, we recommend you remove all op-
tional and unnecessary equipment and racks,
especially if you intend to drive at high
speeds.
Other factors which increase fuel consump-
tion (examples):
● Fault in engine management.
● Driving on hills.
144

Driving
WARNING
Always adapt your speed and the distance to
the v ehic
les ahead in line with visibility,
weather conditions, the condition of the road
and the traffic situation. Engine management and ex-
hau
s

t gas purification system
Introduction WARNING
The components of the exhaust system reach
ver y

high temperatures. This could cause a
fire.
● Always park your vehicle so that no part of
the exhau
st system can come in contact with
flammable materials (such as dried grass).
● Never apply additional underseal or anti-
corro
sion coatings to the exhaust pipes, cata-
lytic converter or the heat shields on the ex-
haust system. Control and warning lamps

It lights up
Fault in engine
management
(Electronic Pow-
er Control).Take the vehicle to a specialised
workshop as soon as possible and
have the engine checked.

It lights up
Fault in catalytic
converter.You should reduce speed according-
ly. Drive carefully until you reach the
next specialised workshop. Have
the engine checked there.

Flashes
Combustion
fault which could
damage the cat-
alytic converter.You should reduce speed according-
ly. Drive carefully until you reach the
next specialised workshop. Have
the engine checked there.
Several warning and indication lamps light
up f
or a f
ew sec

onds when the ignition is
switched on, signalling that the function is
being verified. They will switch off after a few
seconds. CAUTION
Always pay attention to any lit control lamps
and to the c orr

esponding descriptions and in-
structions to avoid damage to the vehicle. Note
While the control lamps  or  r
emain lit,
the engine will have faults, there will be high-
er consumption of fuel and a loss of engine
power. Catalytic converter
The catalytic converter permits the subse-
quent tr
e

atment of the exhaust gases thus
reducing contaminating gas emissions. To
ensure a longer working life for the exhaust
system and catalytic converter in a petrol en-
gine:
● Always use unleaded petrol.
● Never run the fuel tank completely dry.
● Do not top up with too much engine oil
›› ›

page 186.
● Do not tow-start the vehicle; use the starter
cabl
es ›››
 page 42.
If you should notice misfiring, uneven run-
ning or loss of power when the car is moving,
reduce speed immediately. Have the car in-
spected by a specialised workshop. If this
happens, unburnt fuel can enter the exhaust
system and escape into the atmosphere. The
catalytic converter can also be damaged by
overheating. »
145
Technical data
Advice
Operation
Emergencies
Safety

Operation
For the sake of the environment
Even when the emission control system is
work in
g perfectly, there may be a smell of
sulphur under certain conditions. This de-
pends on the sulphur content of the fuel
used. Driving abroad
In some countries, certain safety regulations
and requir
ements

are in force relating to ex-
haust gas emissions, which differ from the
technical characteristics of the vehicle. Be-
fore travelling abroad, SEAT recommends you
consult a technical service about the legal re-
quirements and the following points:
● Does the vehicle need technical modifica-
tions f

or driving abroad, for example, adjust-
ment of the headlamps?
● Does the vehicle have all the tools, diag-
nostic
s equipment and spare parts required
for inspections and repairs?
● Are there any SEAT dealers in the destina-
tion countr
y?
● For petrol vehicles: Is unleaded petrol avail-
able at
the right octane rating?
● For diesel engines: is diesel fuel available
with a low s
ulphur content?
● Are a suitable engine oil ( ›››

page 186) and
other engine fluids complying with SEAT specifications available in the destination
countr

y?
● Will the navigation system fitted at the fac-
tory
operate correctly in the destination coun-
try with the available navigation data?
● Are special tyres required in the destination
countr
y? CAUTION
SEAT does not accept liability for any damage
to the v

ehicle due to the use of a lower quali-
ty fuel, an inadequate service or the non-
availability of genuine spare parts. Driving along flooded roadways
To prevent damage to the vehicle when driv-
in
g thr
ough w

ater, for example, along a floo-
ded road, please observe the following:
● Check the depth of the water before enter-
ing the flooded z
one. The water should never
come above the lower edge of the bodywork
››› .
● Do not drive faster than a pedestrian.
● Do not stop in the water, use reverse gear
or sw it
c

h off the engine.
● Oncoming traffic will cause waves which
raise the l
evel of the water, making it difficult
to cross the water. ●
Disc
onnect the Start-Stop system whenever
crossing water. WARNING
When driving through water, mud, melted
sno w

, etc., please remember that due to
damp or frozen brake discs and shoes in win-
ter, the braking effect may be delayed, there-
fore the required braking distance is greater.
● “Dry the brakes and remove ice” by braking
caref
ully. Ensure that you are not endanger-
ing other road-users or breaking traffic regu-
lations in the process.
● After driving through water, avoid sudden
sharp manoeu
vres. CAUTION
● Drivin g thr

ough flooded areas may severely
damage vehicle components such as the en-
gine, transmission, drive train or electrical
system.
● Never drive through salt water as salt cau-
ses c
orrosion. Always rinse any parts of the
vehicle which have been in contact with salt
water. 146

Driver assistance systems
Driver assistance systems
Br ak
in
g and stability systems
Brake assist systems The assisted braking systems ESC*, ABS,
EBV
, B

AS, ASR, TC and EDL only operate when
the ignition is switched on. They contribute
significantly to increasing active safety.
Electronic Stability Control (ESC)*
ESC* reduces the risk of skidding and increa-
ses the vehicle stability by braking individual
wheels under specific driving conditions.
ESC* detects critical handling situations,
such as understeer, oversteer and wheelspin
on the driven wheels. The system stabilises
the vehicle by braking individual wheels or
by reducing the engine torque.
The ESC* has limits. It is important to realise
that ESC* is also subject to the laws of phys-
ics. ESC* will not be able to deal with all sit-
uations with which drivers may be faced. For
example, if the road surface changes sudden-
ly then ESC* will not be useful in all cases. If
the vehicle suddenly enters a section cov-
ered by water, mud or snow then ESC* will
not provide assistance in the same way as on
dry ground. If the vehicle loses its grip on the ground and moves on a film of water (“aqua-
pl
anin

g”), the ESC* will not be able to help
the driver control the vehicle due to the loss
of adherence with the road surface prevent-
ing braking and steering. If the vehicle is
driven through series of bends at high
speed, the ESC* will not always be as effec-
tive: the vehicle reaction to aggressive driv-
ing is not the same as at reduced speeds.
Adjust your speed and driving style to suit
visibility, and weather, road and traffic condi-
tions. ESC* cannot push the limits of the laws
of physics; improve the transmission availa-
ble or maintain the vehicle on the road if a
lack of driver attention creates an inevitable
situation. Otherwise, ESC* assists in main-
taining vehicle control in extreme situations
and uses the movements of the steering
made by the driver to maintain the vehicle
moving in the desired direction. If the vehicle
is driven at such a speed that it will leave the
road before ESC* can intervene then the sys-
tem cannot provide assistance.
The ABS, BAS, ASR and EDL systems are in-
corporated into the ESC*. The ESC* is always
on 1)
.
Anti-lock system (ABS)
ABS can prevent the wheels from locking dur-
ing braking until just before the vehicle stops thus helping the driver to steer the vehicle
and maintain c
ontrol. This means that, even
during full braking, the risk of skidding is re-
duced:
● Press and hold the brake pedal fully. Do not
remov
e your foot from the brake pedal or re-
duce braking force!
● Do not “pump” the brake pedal, or reduce
brakin
g force!
● Maintain vehicle direction when braking
ful
ly.
● When the brake pedal is released or when
the brake f
orce is reduced, ABS is turned off.
ABS control can be observed by vibration of
the brake pedal and noise. You should never
expect the ABS to reduce the braking dis-
tance under any circumstances. This distance
will increase when driving on gravel, recent
snow or on icy or slippery ground.
Brake assist system (BAS)
The brake assist system may reduce the re-
quired braking distance. The brake assist
system boosts the braking force if you press
the brake pedal quickly in an emergency. As
a result, the braking pressure increases rap-
idly, the braking force is multiplied and the
braking distance is reduced. This enables the »1)
Depending on the version.
147
Technical data
Advice
Operation
Emergencies
Safety

Operation
ABS to be activated more quickly and
eff ectiv
ely
.
Do not lift your foot off the brake pedal!
When the brake pedal is released or when
the brake force is reduced, braking assist au-
tomatically turns off the brake servo.
Traction control system (ASR) or Traction
Control (TC)*
In the event of wheelspin, the traction control
system ASR or TC reduces the engine torque
to match the amount of grip available. The
ASR or TC makes some situations easier, for
example, when starting, accelerating or go-
ing uphill, even in unfavourable road condi-
tions.
Electronic differential lock (EDS)
EDL is available when driving in straight lines
under normal conditions. When the EDL de-
tects wheelspin, it brakes the spinning wheel
and directs the power to the other one. To
prevent the disc brake of the braked wheel
from overheating, the EDL cuts out automati-
cally if subjected to excessive loads. The EDL
will switch on again automatically when the
brake has cooled down. WARNING
Driving at high speed on icy, slippery or wet
grou nd c

an result in loss of vehicle control and serious injury to the driver and passen-
ger
s.
● Adju

st your speed and driving style to visi-
bility
, road, traffic and weather conditions.
Even though the brake assist systems, ABS,
BAS, EDL, ASR and ESC* provide more securi-
ty, do not take unnecessary risks while driv-
ing.
● Brake assist systems can not overcome the
law
s of physics. Even with ESC* and other
systems, slippery and wet roads will always
be dangerous.
● Driving to quickly on wet ground can result
in the wheels lo
sing contact with the ground
in an effect known as “aquaplaning”. Without
adherence, it is impossible to brake, steer or
control the vehicle.
● Brake assist systems cannot avoid acci-
dents if
, for example, the driver does not re-
spect safety distances or drives to quickly in
difficult conditions.
● Even though brake assist systems are ex-
tremely eff
ective and help control the vehicle
in difficult situations, remember that the ve-
hicle stability depends on tyre grip.
● When accelerating on a slippery surface,
for ex
ample on ice or snow, press the acceler-
ator carefully. The wheels can still slip even
with brake assist systems resulting in loss of
vehicle control. WARNING
The effectiveness of the ESC* can be consid-
erab ly

reduced if other components and sys-
tems affecting driving dynamics are not main-
tained or are not functioning correctly. This
includes, among others, brakes, tyres and
other systems already mentioned.
● Remember that changing and fitting other
components
to the vehicle can affect opera-
tion of the ABS, BAS, ASR TC, EDL and ESC*.
● Changes to the vehicle suspension or using
unap
proved wheel/tyre combinations can af-
fect operation of the ABS, BAS, ASR, TC, EDL
and ESC* and their effectiveness.
● Likewise, the effectiveness of ESC* de-
pends on the u
se of suitable tyres
››› page 197. Note
● To en s

ure that the ESC*, ASR and TC work
properly, all four wheels must be fitted with
identical tyres. Any differences in the rolling
radius of the tyres can cause the system to
reduce engine power when this is not de-
sired.
● If a malfunction should occur in the ABS,
the ESC*, ASR, T
C and EDL will also be affec-
ted.
● Noises may be heard while any of the
above sy
stems are operating.148

Driver assistance systems
Warning and control lamp The City Safety Assist function is switched on
ever
y
time the ignition is switched on. No
special indication is produced.
If the City Safety Assist function is switched
off or on, or if there is an error in the system,
it will be shown by a control lamp on the in-
strument panel display. 

It lights up
The City Safety Assist
function has been
switched on manual-
ly using the button
  ››› Fig. 152.
The control lamp turns off after
about 5 seconds. 
Flashes
Fast: The City Safety
Assist system func-
tion brakes automat-
ically or has braked
automatically.
Control lamp turns off automati-
cally.
Slow: City Safety As-
sist function is not
currently available.
If the vehicle is stopped, switch
off the engine and switch it on
again. If necessary, inspect the
radar sensor (dirt, frost)
›››
in
Radar sensor on page 154. If it
still does not function, refer to a
Specialised workshop to have
the system inspected.  
Flashes
Within the operating
area of 5-30 km/h
(3-19 mph): The City
Safety Assist func-
tion has been
switched off manual-
ly using the button
 
››› Fig. 152.
Switch on the City Safety Assist
function manually using the
button
  ››› Fig. 152. Several warning and indication lamps should
light up f
or a f

ew seconds when the ignition
is switched on, signalling that the function is
being verified. They will switch off after a few
seconds. WARNING
If the warning lamps are ignored, the vehicle
ma y

stall in traffic, or may cause accidents
and severe injuries.
● Never ignore the warning lamps.
● Stop the vehicle safely as soon as possible. CAUTION
Failure to heed the warning lamps when they
appe ar m

ay result in faults in the vehicle. Radar sensor
Fig. 150
In the windscreen: City Safety Assist
f u
nction r

adar sensor. Fig. 151
Radar sensor detection area. A radar sensor on the windscreen
››
›
Fig. 150
allows the system to detect driving situations
in front of the vehicle.
Vehicles ahead can be detected up to a dis-
tance of about 10 m. »
153
Technical data
Advice
Operation
Emergencies
Safety

Operation
Hill driving assistant* Oper ation This function is only included in vehicles with
ESC.
The hi
l
l driving assistant helps the driver to
move off and upward on a hill when the vehi-
cle is stationary.
The system maintains brake pressure for ap-
proximately two seconds after the driver
takes his foot off the brake pedal to prevent
the vehicle from lurching backward when it is
started. During these 2 seconds, the driver
has enough time to release the clutch pedal
and accelerate without the vehicle moving
and without having to use the handbrake,
making start-up easier, more comfortable
and safer.
These are the basic operation conditions:
● being on a ramp or hill/slope,
● doors closed,
● vehicle completely stationary,
● engine running and foot on the brake,
● besides having a gear engaged or being in
neutral f

or manual gear change and with the
selector lever at positions S, D or R in vehi-
cles with an automatic gearbox.
This system is also active when reversing up-
hill. WARNING
● If y

ou do not start the vehicle immediately
after taking your foot off the brake pedal, the
vehicle may start to roll back under certain
conditions. Depress the brake pedal or use
the hand brake immediately.
● If the engine stalls, depress the brake ped-
al or u
se the hand brake immediately.
● When following a line of traffic uphill, if you
want t
o prevent the vehicle from rolling back
accidentally when starting off, hold the brake
pedal down for a few seconds before starting
off. Note
The Official Service or a specialist workshop
can t el

l you if your vehicle is equipped with
this system. Start-Stop System
C ontr
o

l lamps 
It lights up
The Start-Stop system is enabled. 
It lights up
The Start-Stop sys-
tem is enabled but
the engine cannot
be automatically
stopped.
Contact a specialised workshop.

It lights up
The Start-Stop sys-
tem cannot start the
engine.Start the engine by hand using
the vehicle's key
››› page 130.
There is a fault in the
alternator.››› page 193 
Flashes
The Start-Stop sys-
tem is not available.Contact a specialised workshop.
Some warning and indication lamps will light
up briefly
when the ignition i
s

switched on to
check certain functions. They will switch off
after a few seconds. WARNING
Observe the safety warnings ›››
in On the
ins trument
panel on page 27. 156

Driver assistance systems
Start-Stop system Fig. 155
At the top of the centre console:
St ar
t
-Stop system button With the Start-Stop system enabled, the en-
gine i
s
aut

omatically stopped when the vehi-
cle is at a standstill. It will start again auto-
matically as required.
This function remains enabled while the igni-
tion is switched on. The instrument panel dis-
play shows information on the current status
››› page 156.
Disconnect the Start-Stop system by hand
whenever crossing water.
Vehicles with a manual gearbox
● When the vehicle is stopped, put it into
neutral and r
elease the clutch pedal. The en-
gine will stop.
● To restart, simply engage the clutch. Vehicles with an automatic gearbox
●
When the vehicle is at a standstill, depress
the brake or k
eep it pressed down. The en-
gine switches off.
● The engine will start again as soon as you
rele
ase the brake pedal.
● With the selector lever set to position N,
the engine wi
ll not start until a range of gears
is selected or the accelerator pedal is de-
pressed.
Important conditions for the engine to stop
automatically
● The driver's seat belt must be fastened.
● The driver door must be closed.
● The bonnet must be closed.
● The engine must have reached a minimum
temperat
ure.
● The vehicle must have moved since the last
time the engine wa
s stopped.
● The vehicle's battery must be sufficiently
char
ged.
● The battery temperature must not be too
low or too high.
● The

vehicle must not be on a very steep
slope. Condition

s for the engine to restart automat-
ical
ly
The engine can be automatically restarted in
the following cases:
● If the vehicle starts to moves.
● If the battery voltage drops.
Conditions
requiring engine start-up using
the key
The engine has to be manually started in the
following cases:
● If the driver unbuckles his/her seat belt.
● If the driver door is opened.
● If the bonnet is opened.
Switc
hing the Start-Stop system on and off
● Press the button  situat
ed in the centre
console ››› Fig. 155.
● The button will light up when the Start-Stop
syst
em is switched off.
The engine will start immediately if the vehi-
cle is in Stop mode when the system is
switched off by hand. WARNING
The smart technology included in the hill
hol d c

annot change the laws of physics. Do
not let the extra convenience afforded by the » 157
Technical data
Advice
Operation
Emergencies
Safety